Compare the surface of Earth to that of the moon. Why doesn't Earth's land retain the same scarring from meteorite impact as the moon? Why doesn't Earth's ocean retain the same scarring from meteorite impact?
What will be an ideal response?
Answer: Earth has liquid water and an atmosphere, which help weather away evidence on the surface. However, oceans primarily cover the surface of Earth, which means that there would be a greater likelihood of a meteorite falling in the ocean. There is not a great deal of meteorite impact evidence preserved on the ocean floor because the ocean crust is continually subducting. The oldest part of the seafloor is no more than 200 million years old, which is significantly younger than the timing of the great bombardments in early Earth's history. The moon has no processes of weathering to remove such evidence.
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Strains of genetically modified food crops can hybridize with wild crop varieties when
a. The process is carefully controlled in an agricultural lab. b. Pollen blows from the genetically modified crop and spreads among wild varieties. c. Pollen is transferred by the farmer from one crop to the other. d. It is not possible for a genetically modified plant to hybridize with a wild species. e. More than one of these answers is correct
Anthracite is a bituminous coal that has not been exposed to very much heat or pressure
a. True b. False
Smoking contributes to the risk of all of the following, except
A) lung cancer. B) heart disease. C) COPD and other related lung diseases. D) malaria and tuberculosis.
?Urban sprawl is the product of affordable land, automobiles, and inadequate urban planning.
Answer the following statement true (T) or false (F)